This is the final report of a study commissioned by the UK Ministry of Defence (MOD) through the Defence Human Capability Science and Technology Centre (DHCSTC) framework. The study was conducted over a period of six weeks and examines the academic debate pertaining to the moral landscape of conflict that spans different military domains (air, maritime, land, space, cyber). The investigation which is the subject of this report was commissioned by the Programme and Delivery Directorate of the Defence Science and Technology Laboratory (Dstl).